<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品添加</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>
      <!-- 步骤条区域 -->
      <!-- 
          active：用来指定激活项的索引
       -->
      <el-steps
        :space="300"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <!-- 
            before-leave：切换标签之前的钩子，若返回false或返回promise且被reject，则阻止切换 
            tab-click：tab被选中时触发
        -->
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="catelist"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableData"
              :key="item.attr_id"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="cb"
                  v-for="(cb, i) in item.attr_vals"
                  :key="i"
                  border
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableDate"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- 图片上传组件 -->
            <!-- 
              action：上传图片要请求的API接口(路径要写完整)
              on-preview：预览图片的事件
              on-remove：移除图片时的事件
              list-type：指定当前预览组件的呈现方式（picture是图片方式）
              on-success：文件上传成功时的钩子
             -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce" />
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add"
              >添加商品</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览的组件 -->
    <el-dialog title="图片预览" :visible.sync="previewVisble" width="50%">
      <img :src="previewPath" alt="" class="previewImg" />
    </el-dialog>
  </div>
</template>

<script>
//导入lodash以深拷贝
import _ from "lodash";

export default {
  data() {
    return {
      activeIndex: "0",
      //添加商品的表单数据对象
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        //商品所属的分类数组
        goods_cat: [],
        //上传的图片临时路径
        pics: [],
        //商品详细描述
        goods_introduce: "",
        attrs: [],
      },
      //校验规则
      addFormRules: {
        goods_name: [
          { required: true, message: "输入商品名称", trigger: "blur" },
        ],
        goods_price: [
          { required: true, message: "输入商品价格", trigger: "blur" },
        ],
        goods_weight: [
          { required: true, message: "输入商品重量", trigger: "blur" },
        ],
        goods_number: [
          { required: true, message: "输入商品数量", trigger: "blur" },
        ],
        goods_cat: [
          { required: true, message: "选择商品分类", trigger: "blur" },
        ],
      },
      //商品分类列表
      catelist: [],
      //级联选择器的配置项
      cateProps: {
        expandTrigger: "hover",
        label: "cat_name", //看到的是哪个属性
        value: "cat_id", //选中的是谁的值
        children: "children", //哪个属性实现父子节点的嵌套
      },
      //动态参数列表的数据
      manyTableData: [],
      //静态属性列表数据
      onlyTableDate: [],
      //上传图片的URL地址
      uploadURL: "http://127.0.0.1:8888/api/private/v1/upload",
      //图片上传组件的headeras请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem("token"),
      },
      previewPath: "",
      //图片预览的dialog组件的previewVisble属性，以控制其显示与隐藏
      previewVisble: false,
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取所有商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取分类失败，稍后再试");
      }
      this.catelist = res.data;
    },
    //级联选择器选中项变化触发函数
    handleChange() {
      //只允许选择三级分类
      if (this.addForm.goods_cat.length !== 3) {
        this.$message.error("请选择三级分类");
        this.addForm.goods_cat.length = [];
      }
    },
    //欲离开基本信息这个标签页时触发，oldActiveName=0表示第一个标签页(基本信息这个标签页)
    beforeTabLeave(activeName, oldActiveName) {
      /* 
        activeName：即将进入的那个标签页的name名称
        oldActiveName：即将离开的那个标签页的name名称
        */
      //若即将离开的那个标签页是'基本信息'这个标签页，并且选择的不是三级分类
      if (oldActiveName === "0" && this.addForm.goods_cat.length !== 3) {
        this.$message.error("请先选择商品分类");
        return false;
      }
    },
    async tabClicked() {
      //证明访问的是动态参数面板
      if (this.activeIndex === "1") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "many" },
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("获取列表失败，稍后再试");
        }
        res.data.forEach((item) => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(",");
        });
        //console.log(res.data);
        this.manyTableData = res.data;
      } else if (this.activeIndex === "2") {
        //访问的是静态属性面板
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "only" },
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("获取静态属性失败，稍后再试");
        }
        this.onlyTableDate = res.data;
        //console.log(res.data);
      }
    },
    //处理图片预览效果
    handlePreview(file) {
      this.previewPath = file.response.data.url;
      this.previewVisble = true;
    },
    //移除图片时触发
    handleRemove(file) {
      //1、获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path;
      //2、从pics数组中，找到此图片对应的索引值
      let i = this.addForm.pics.findIndex((x) => {
        x.pic === filePath;
      });
      //3、调用数组的splice方法，把图片信息对象从pics数组中移除
      this.addForm.pics.splice(i, 1);
      //console.log(this.addForm);
    },
    //图片上传成功时触发的函数
    handleSuccess(res) {
      //拼接得到图片信息对象
      const picInfo = { pic: res.data.tmp_path };
      //将图片信息对象push到pics数组中
      this.addForm.pics.push(picInfo);
    },
    //添加商品按钮
    add() {
      //表单预验证
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) {
          return this.$message.error("请完整填写表单");
        }
        //添加的业务逻辑
        /* 将goods_cat转为字符串,深拷贝addForm 
           addForm中的goods_cat是数组，因为级联选择器
           双向绑定到了此数组上(也只能是数组)，若要将其转为
           字符串，则需深拷贝一份addForm
        */

        const form = _.cloneDeep(this.addForm);
        form.goods_cat = form.goods_cat.join(",");

        //处理动态参数
        this.manyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(" "),
          };
          this.addForm.attrs.push(newInfo);
        });
        //处理动态属性
        this.onlyTableDate.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals,
          };
          this.addForm.attrs.push(newInfo);
        });
        form.attrs = this.addForm.attrs;
        //console.log(form);
        //发起请求添加商品(商品名称须是唯一的)
        const { data: res } = await this.$http.post("goods", form);
        if(res.meta.status !== 201){
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加success')
        this.$router.push('/goods')
      });
    },
  },
  //计算属性
  computed: {
    cateId() {
      //若是3级分类
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      }
      return null;
    },
  },
};
</script>

<style lang='less' scope>
.el-checkbox {
  margin-right: 5px !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 20px !important;
}
</style>